My Dad was Senior Electrical Foreman at BAC when Concords were being built and would have been responsible for all of the electrics in all of the Concords.
His brother (my uncle) was senior hydraulics engineer and was responsible for overseeing all of the hydraulics in all of the Concords.
When I was a kid, my Dad took me to his office one day, and we went up on a test flight in Concord. It was fantastic. In those days, they could fly supersonic over land. And they did!